HYDRAULICS
4252490-Rev A 6-35
6
12. Calculate gear pump leakage.
(Step 13 of previous test – Step 10 / Step 13 of
previous test x 100 = Leak Percentage)
Is gear pump leakage 10% or less?
YES The gear pump is good. Proceed to step 13.
NO Proceed to next question.
Is gear pump leakage 11–20%?
YES The gear pump is marginal. Additional
testing is required. Proceed to step 13.
NO Proceed to next question.
Is gear pump leakage 21% or more?
YES Repair or replace gear pump. See “Gear
Pump” on page 6-43, then proceed to
step 13.
NO Proceed to step 13.
13. (See Figure 6-25.) Disconnect hydraulic hose (1) at
tee fitting (3) and remove blocking disk. Reconnect
hydraulic hose to tee fitting.
14. Proceed to “Reel Valve Unit Test” on page 6-35.
Reel Valve Unit Test
See Figures 6-28 through 6-30.
IMPORTANT
• Performing this test will isolate the reel valve unit
from the rest of the cutting units circuit.
• This test works together with the cutting units
circuit test, gear pump test, and reel motors test
to isolate a problem with the cutting units circuit.
!
WARNING
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Before performing this test, perform cutting units
circuit test, leaving flow meter connected as outlined.
Figure 6-28
3. Install blocking disk at fitting (1) on right reel motor,
blocking oil flow from entering right reel motor.
Figure 6-29
4. Open flow meter valve (2) completely.
The hydraulic system is under pressure, and the
oil will be hot.
• Always relieve pressure in the hydraulic
system before performing service.
• Failure to follow appropriate safety
precautions may result in death or serious
injury.
Required Tools and Materials
• Flow Meter
• -8 ORFS Test Hose 4000 psi (276 bar)
• -8 ORFS Tee Fitting
• -8 ORFS Blocking Disk
TN3716
1
TN1363
2
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